US4902561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lock set structure
Assignee: Dow Chemical Co
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Filing: 1989-04-27
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Granted: 1990-02-20
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Expires: 2009-04-27
Abstract
Abstract A process for producing an interlocked fibrous structure useful as a thermal insulating and/or sound absorbing structure comprising at least one batting of non-flammable carbonaceous fibers, by the steps comprising implanting said batting with non-carbonaceous polymeric fibers and then heat treating the structure in an inert atmosphere so as to transform said non-carbonaceous fibers into substantially permanently set carbonaceous fibers.
Inventors
- 👤 Francis P. McCullough, Jr.
- 👤 R. Vernon Snelgrove
- 👤 Bhuvenesh C. Goswami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:53
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/42; D04H1/4209; D04H1/4242; D04H1/4282; D04H1/43; D04H1/4382; D04H1/43835; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/24992; Y10T428/30; Y10T442/00; Y10T442/50; Y10T442/56
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
56 words
A densified batting structure comprising a batting of linear and non-linear first carbonaceous fibers having an LOI value greater than 40, a reversible deflection ratio greater than 1.2:1 and an aspect ratio greater than 10:1 and a substantially permanently heat set non-flammable second carbonaceous fiber densifying said batting and locking said batting into a densified structure.
Claim 2
Dependent Claim
56 words
A densified batting structure comprising a batting of linear and non-linear first carbonaceous fibers having an LOI value greater than 40, a reversible deflection ratio greater than 1.2:1 and an aspect ratio greater than 10:1 and a substantially permanently heat set non-flammable second carbonaceous fiber densifying said batting and locking said batting into a densified structure.
Claim 3
Dependent Claim
19 words
The structure of claim 1 wherein said second carbonaceous fiber has a higher denier than said first carbonaceous fibers.
Claim 4
Dependent Claim
21 words
The structure of claim 1 wherein said first and second carbonaceous fibers have a nitrogen content of about 16 to 20%.
Claim 5
Dependent Claim
17 words
The structure of claim 1 wherein said second carbonaceous fibers are different from said first carbonaceous fibers.
Claim 6
Dependent Claim
45 words
A densified batting structure comprising a batting of non-linear first carbonaceous fibers having a reversible deflection ratio greater than 1.2:1 and an aspect ratio greater than 10:1 and a heat set second carbonaceous fiber densifying said batting and locking said batting into a densified structure.
Claim 7
Dependent Claim
45 words
A densified batting structure comprising a batting of non-linear first carbonaceous fibers having a reversible deflection ratio greater than 1.2:1 and an aspect ratio greater than 10:1 and a heat set second carbonaceous fiber densifying said batting and locking said batting into a densified structure.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-19 | 1993-08-21 | 1994-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-19 | 1997-08-21 | 1998-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-19 | 2001-08-21 | 2002-02-20 | $7700.00 | Window Closed / Lapsed |